Features: Automatic filling, instant heat-up, and dishwasher safe glass. 510 thread compatibility for concentrates and herbs 4 Heat settings: 2.5 V, 3.0V, 3.5V, 4.0V Includes: 1 x Zenco Duo 2 x Duo Glasses 2 x Vapor Coils 1 x USB Charger 1 x Concentrate Scoop 1 x Cleaning brush Contains Removable Food-Grade Silicone Diffuser A pair of glasses are included so you can share. All Zenco glassware is interchangeable 1 Year Limited Warranty *Available in Wood, Onyx (black), Stone (grey), or Leaf (green).